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A study found there to be an excess of bladder tumours among men engaged in the manufacture of auramine, through inhaling harmful agents, such as formaldehyde and sulphur, during the manufacturing process.

Yellow: Auramine 4 parts, sulphate of soda 10 parts, mixed in water.

Yellow.—Auramine, benzoflavine, thioflavine T, acridine yellow, homophosphine, rhoduline yellow.

Methyl Violet, Auramine and Methylene Blue, because of their special physiological action.

One of these dyes is a fine basic yellow known as “auramine,” which is a derivative of diphenylmethane.